Intel Sandy Bridge CPU In-Depth Look at Overclocking, Memory Timings and More

CPU by leeghoofd @ 2011-02-01

First introduced at the CES, Intel’s new Sandy Bridge CPU architecture is here to flood the mainstream market with over 25 CPUs. Don't panic, most are foreseen for the mobile market and only 9 new models will be introduced for the desktop segment. Coinciding with this new release is also a new socket design. 1155 pins will be the new standard for Intel’s mainstream lineup. Yes you guessed it, Sandy bridge is here to replace socket 1156. Slowly but steadily Clarkdale and Lynnfield will become End Of Life and will be phased out. At the Sandy Bridge Tech conference the representatives of Intel said that the current S1366 i7 lineup (Bloomfield and Gulftown) will remain their high end platform. Time to explore Sandy Bridge...

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Timings galore... let's start with 1333Mhz

From the previous page we can conclude that Sandy Bridge loves high ram speeds. Though can we squeeze some more points or FPS out of it, when messing with the main RAM timings ? Let's start off with 1333Mhz. Yep I again ditched a RAM divider, as the 1066Mhz might be sort off interesting for laptop integrators. For desktop users it shouldn't even be an option to buy...

I used the 2500K on the same bench-suites of the previous pages. Testing the following timings :

For 1333Mhz and 1600mhz : CL6-6-6-18, CL7-7-7-21 and 8-8-8-24 

For 1866 : CL7-7-7-21, CL8-8-8-24 and CL9-9-9-27

For 2133 : CL7-8-7-21, CL8-8-8-24 and CL9-9-9-27

1333Mhz is up first :

Both SuperPi 1M and Wprime 32  tests are very short and more in favour of raw CPU clocks. The differences are really small between Cas 6 and 8.  

Superpi 32M almost gains about 7 seconds. Nothing shabby for a bencher, for a daily user the difference the gain is negligible.

AIDA64's memory benchmark only shows an improvement in the Read test. Write and Copy stay put. Maybe this will change with higher ram clocks.

Encoding a file into HD quality almost gains nothing either from faster timings. Not even a full FPS is won.

 Cinebench improves also a tiny bit with the Cas 6 setting. Nothing earth shattering though

 Finally a nice improvement : PCMark05 seems to like tighter timings. 300 points gain is really nice.

The Synthetic 3DMarks from Futuremark again show slightly better scores with tighter timings. Especially the 3DMark 01 score is improving with over 1000 points.

By limiting the resolution to 1280 x1024 our GTX 480 is CPU limited. The tiny gain observed will be not noticeable when upping resolutions and detail level. For a gamer if 1333Mhz is your weapon of choice , even Cas 8 will do nicely.

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Comment from Teemto @ 2011/02/02
52x102 here with flares at 2176-6/9/6/24
SuperPi and Pifast stable.
Comment from leeghoofd @ 2011/02/02
So use these clocks too then for 3D Pascal
Comment from Teemto @ 2011/02/02
Yes my master.
Comment from thorgal @ 2011/02/03
So which settings did you use for 5Ghz It's those "just a few settings" that interest me

I always want to learn from a master
Comment from Stefan Mileschin @ 2011/02/04
Quote:
Originally Posted by Teemto View Post
Yes my master.
Is the system stable in 3DMark 2005 CPU test too at those frequencies?
Comment from Teemto @ 2011/02/04
Nope. That's realy the max I could go.
Haven't played around with the other voltages though.
Maybe Albrecht can shed some light if this could improve stability/OC'ability?

 

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